Ellicott's Commentary On The Whole Bible
1 Chronicles 19:13
Be of good courage. — The same verb was rendered “be strong” in 1 Chronicles 19:12.
Let us behave ourselves valiantly. — The same verb again, in reflexive form. Thus the whole runs literally: Be strong, and let us shew ourselves strong!
And let the Lord do ... — Literally, And Jehovah — the good in his own eyes may he do! The order in the Hebrew of Samuel is that of the Authorised Version here. The chronicler lays stress on the auspicious word “good.” There is also emphasis on “Jehovah,” as leaving the issue in His hands who is Lord of hosts and God of battles; and on the verb, expressive of a pious wish that right may not miscarry. Evidently the spirit which inspired the prayer, “Thy will be done,” was not unknown to the warriors of the old theocracy.